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PostPosted: Tue Oct 23, 2018 8:20 pm 
Old School Hero

Joined: Sat Jul 22, 2017 9:38 pm
Posts: 150
Update Nov. 10, 2019: new specs/pictures p. 5-6

Dear RBers,

My first rebuild. For the impatients, the before/after pictures, with technical data below.

Attachment:
File comment: Rocky Mountain Cirrus as advertised
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Attachment:
File comment: Rocky Mountain Cirrus as rebuilt
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Attachment:
File comment: Rocky Mountain Cirrus as rebuilt
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Frame: Rocky Mountain Cirrus, 21.5" size

Fork: Rock Shox Mag 21, 200mm 1 1/8" threaded steerer/crown, 60mm "long travel" kit

Headset: Shimano Deore XT HP-M736, 1 1/8"
Stem: 1st gen. Syncros Cattleprod, 120mm 0° rise, Syncros Monoshim 25.4mm shim
Handlebar: Syncros Flatbar, 5° bend
Grips: ODI Attack
Barends: N/A

Brakes: Shimano Deore XT BR-M734
Brake Pads: (update Nov. 10, 2018) Shimano Deore XT M System
Brake Cables: Shimano SLR MT-092
Cantilever cable hangers: Shimano B/82
Brake Levers: Shimano Deore XT ST-M092 Servo Wave SLR Plus

Shifters: Shimano Deore XT ST-M092 Rapidfire
Front Derailleur: Shimano Deore XT FD-M735, 34.9mm bottom pull
Rear Derailleur: Shimano Deore XT RD-M735-SS (Short Cage), max/total 28 teeth
Derailleur Cables: Shimano SIS Sealed SP
Cassette: Shimano Deore XT CS-HG90, 7-speed 11-28 teeth
Chain: Shimano Deore XT CN-HG91, 102 links
Cranks: Shimano Deore XT FC-M730, 175mm
Crank Bolts: Shimano Deore XT
Chainrings: Shimano SG C-24/36/46, round
Chainring bolts: Shimano Deore XT
Bottom Bracket: Shimano Deore XT BB-UN71, 68 x 127.5mm English thread
Pedals: onZa High Output BPD-1401, stainless steel spindle

Hub Skewers: (update Nov. 10, 2019) Pulstar (front), Shimano Deore XT (rear)
Rims: Wolber AT 400 Titanium Light, 26" 32 holes
Hubs: Syncros Hardcore (front), Shimano Deore XT FH-M732 (rear), 32 holes
Nipples: ?
Spokes: DT Swiss Competition
Tyres: (update Apr. 29, 2019) Panaracer Smoke/Dart Classic, 26 x 2.10
Tubes: Depends on punctures...

Saddle: (update Nov. 10, 2019) Selle Italia Flite Transalp
Seatpost: 2nd gen. Syncros Propost 30.4 x 330mm
Seatpost Binder: Shimano Deore XT SQ-M730

Weight: (update Nov. 10, 2019) 12.5kg, including pedals

PS: As English is not my mother tongue, don't hesitate to correct my sentences, vocabulary, spelling, grammar, etc.


Last edited by foxb13 on Sun Nov 10, 2019 4:51 pm, edited 7 times in total.

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PostPosted: Tue Oct 23, 2018 8:24 pm 
Old School Hero

Joined: Sat Jul 22, 2017 9:38 pm
Posts: 150
It's all started with a classified on eBay Germany in the summer of 2017. The bike was plainly advertised as '94 classic/cult MTB from Canadian manufacturer Rocky Mountain. I was dreaming of the Cirrus since I first saw it in a '91 or '92 issue of French MTB magazine Vélo Vert, IIRC. I thus quickly made the deal with the vendor, a cool German guy who was able to tell me more. The bike was bought new in 1994 by his father in a LBS in Vancouver, where he was a student BITD. He eventually came back home with the bike that evolved as a commuter over the years before lying unused in the cellar (dry conditions, fortunately) for the last 15 years. 10 hours and 1000km later (local pickup in Germany), it was mine.
Attachment:
File comment: Rocky Mountain Cirrus at home
4.jpg
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Last edited by foxb13 on Thu Oct 25, 2018 10:07 pm, edited 1 time in total.

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PostPosted: Tue Oct 23, 2018 8:49 pm 
Old School Hero

Joined: Sat Jul 22, 2017 9:38 pm
Posts: 150
Bike S/N is YA1Z429, meaning it was built in 1992. As RockiMtn's Cirrus [1], the color scheme however differs from the bike presented in the '92 Rocky Mountain catalogue. It is rumored that this finish was available as a frame set only [2]. This is further emphasized on my bike by some of the still original components: the front wheel, derailleurs and crank. The front derailleur is Deore DX whereas '92 Cirrus came standard with Deore XT drivetrain. While matching the specs, the Deore XT front hub is stamped with Shimano date code RB, indicating it was manufactured in February 1993. Additionally, the front rim is Wolber AT 400, as on several '93 Rocky Mountain bikes vs. AT 18 on '92 Cirrus. All this suggests that the bike was probably assembled in 1993.

Attachment:
File comment: Original Shimano Deore XT HB-M730 front hub
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Attachment:
File comment: Original Wolber AT 400 Titanium Light front rim
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Attachment:
File comment: Original Shimano Deore DX FD-M650 front derailleur and Deore XT FC-M730 crankset
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Attachment:
File comment: Original Shimano Deore XT RD-M735-SS (Short Cage) rear derailleur
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Last edited by foxb13 on Fri Apr 26, 2019 10:23 pm, edited 2 times in total.

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PostPosted: Tue Oct 23, 2018 8:55 pm 
Old School Hero

Joined: Sat Jul 22, 2017 9:38 pm
Posts: 150
The other components were replaced over the years (fork, cockpit, rear wheel, brakes, tires, middle chainring, pedals, seat clamp, skewers) or are simply missing (saddle, *cough* seatpost *cough*, outer chainring).
Attachment:
File comment: Rock Shox SID Race
5.jpg
5.jpg [ 442.17 KiB | Viewed 1134 times ]

Attachment:
File comment: Cockpit with Magura HS22 Raceline D B@rtman brakes, Grip Shift SRT-800 X-Ray shifters, Giant grips, Syntace Vector Ultralite handlebar and hinged Syncros stem
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Attachment:
File comment: NC-17 Sudpin II Pro pedals
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Attachment:
File comment: Shimano Deore XT FH-M737 freehub
10.jpg
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Attachment:
File comment: Ritchey Rock 415 E rear rim
11.jpg
11.jpg [ 387.98 KiB | Viewed 1134 times ]


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PostPosted: Tue Oct 23, 2018 9:00 pm 
Old School Hero

Joined: Sat Jul 22, 2017 9:38 pm
Posts: 150
Albeit not perfect, the frame is still in great shape overall: no cracks, dents or bad scratches. I thus opted to leave it as is, with it's imperfect harmonies. No tedious decals stripping nor frame polishing that would have over-restored the bike.
Attachment:
File comment: Frame before cleaning
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Attachment:
File comment: Frame (detail) before cleaning
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Just a little bit metal cleaner to deoxidize everything did wonders, IMHO.
Attachment:
File comment: Frame deoxidized
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Attachment:
File comment: Frame deoxidized (detail)
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PostPosted: Tue Oct 23, 2018 9:01 pm 
Old School Grand Master

Joined: Wed Feb 26, 2014 8:20 pm
Posts: 6705
Great project, look forward to seeing it come together.

I did one myself a few years back, see if I can find the thread to give you some inspiration :)


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PostPosted: Tue Oct 23, 2018 9:04 pm 
Old School Grand Master

Joined: Wed Feb 26, 2014 8:20 pm
Posts: 6705
viewtopic.php?f=6&t=323398&hilit=Rocky+Mountain


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PostPosted: Tue Oct 23, 2018 9:09 pm 
Old School Hero

Joined: Sat Jul 22, 2017 9:38 pm
Posts: 150
Thanks Minifreak. I initially planned to rebuild the bike as advertised in '92 Rocky Mountain catalogue and started collecting the required components. By chance, a NOS "noodless" 1st gen. Syncros Cattleprod stem, exactly as pictured in the catalogue, was quickly located in Germany.

A NOS Shimano Deore XT SQ-M730 quick release, FD-M735 front derailleur, SG C-46 outer chainring, as well as NIB HP-M736 head set and CN-HG91 chain followed shortly.
Attachment:
File comment: Shimano Deore XT SQ-M730 quick release
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Attachment:
File comment: Shimano SG C-46 outer chainring
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Attachment:
File comment: Shimano Deore XT FD-M735 front derailleur
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Attachment:
File comment: Shimano Deore XT HP-M736 head set
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Attachment:
File comment: Shimano Deore XT HP-M736 head set
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Attachment:
File comment: Shimano Deore XT CN-HG91 chain
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Attachment:
File comment: Shimano Deore XT CN-HG91 chain
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But the still original front wheel from 1993 eventually convinced me to depart from the strict '92 specs, allowing me to pick up parts in the '93 Rocky Mountain range of components, despite the Cirrus no more being made this year. To start with, I had to find a matching 32-hole Wolber AT 400 rim for the rear wheel. This didn't take that much before I source a NOS one in Germany.
Attachment:
File comment: Wolber AT 400 rim
25.jpg
25.jpg [ 324.37 KiB | Viewed 1127 times ]


Last edited by foxb13 on Sun Nov 04, 2018 2:31 pm, edited 1 time in total.

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PostPosted: Tue Oct 23, 2018 9:16 pm 
Old School Hero

Joined: Sat Jul 22, 2017 9:38 pm
Posts: 150
"with dedicated Rockshox geometry" as can be read in the '92 Rocky Mountain catalogue, the choice for the front was obvious. Well, more or less. Indeed, the Cirrus was spec'd with a Mag 30, though I seem to discern damping adjuster knobs at the top of the upper tubes on the bike pictured in the catalogue. As well as on the Mag 20 of the '92 Cirrus pictured below.
Attachment:
File comment: Brutal landing
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OK, OK, the stem, shifters and crankset (Syncros Revolution?) are also different than in the '92 Rocky Mountain catalogue. Not speaking about the added bar ends ;-) While he no more holds photos of how the bike looked like when his father bought it new, the previous owner seemed to remember that it sported a Rock Shox Quadra fork. For sure, the light grey/silver color of the Quadra was probably pleasantly matching the raw aluminium finish of the frame. But I was less than impressed by the performances of the Quadra when it debuted in 1993. So thanks, but no thanks. But this at least learned me two things. Firstly, some compromises were done on the original build of the bike: lower grade Deore DX front derailleur and elastomer-sprung fork vs. XT derailleur and air/oil fork as standard. Secondly, the bike was delivered with a fork from (at least) 1993. This year, besides the Quadra, the only other option available from Rock Shox was the newly-introduced and well-acclaimed Mag 21 hydraulic fork (the Mag 10 debuted production in 1994). Presented as "the ultimate downhill formula" in the '92 Rocky Mountain catalogue, my Cirrus thus deserves nothing but a '93 Mag 21 for the front. And I precisely just found one, still in working condition and holding air, but with wrong brace, incorrectly sized steerer and missing the canti bosses and the tiny screws of the damping adjuster knobs :-P
Attachment:
File comment: '93 Rock Shox Mag 21
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Attachment:
File comment: '93 Rock Shox Mag 21
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Attachment:
File comment: '93 Rock Shox Mag 21 S/N
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Last edited by foxb13 on Sun Nov 10, 2019 2:44 pm, edited 2 times in total.

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PostPosted: Tue Oct 23, 2018 9:24 pm 
Old School Hero

Joined: Sat Jul 22, 2017 9:38 pm
Posts: 150
Notorious for its lateral flex, the Mag 21 will probably benefit being paired with a "suspension" hub. This quickly ruled out Shimano as the Parallax series wasn't yet on the market. And led me to interesting readings for days. Ringlé, Bullseye and Pulstar were famous names BITD. Ringlé hubs were apparently prone to flange cracking. Bullseye rear hub didn't accomodate for a Shimano HG cassette. And finding original Pulstars with the right bearings and freewheel was tricky. Not to mention that I already own another bike with Pulstar hubs. Mavic Gao Dakar/531/577 were great choices too but, again, didn't suit a Shimano HG cassette. Then, all of a sudden, I stumbled across this NOS Syncros hub I didn't even knew the existence before.
Attachment:
File comment: Syncros Hardcore front "suspension" hub
30.jpg
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I later discovered that this Syncros Hardcore hub was in fact introduced in 1994, so slightly off by one year from my plans. In retrospect, I even could have gone with a Shimano Parallax hub that was marketed the same year! But in the end, I find the Syncros hub more cool, with the possibility to adjust the preload as the bearings wear, even though it seems it wasn't that great of a suspension hub, despite its 15mm axle [1]. Probably in an effort to work around this, Syncros introduced in 1996 the Hardcore DH hub with stiffer heat treated nickel cro-moly axle (vs. ceramic coated Zicral for the Hardcore hub) and titanium axle bolts. Since the Hardcore hub shares the same "cabriolet design" with the Hardcore DH hub, it can easily converts to the titanium axle bolts for increased system rigidity (2.5 times over quick release).
Attachment:
File comment: Syncros Hardcore front "suspension" hub
31.jpg
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Update Nov. 10, 2019: Syncros Hardcore hub now replaced with a more 1993er Pulstar front suspension hub (p. 5).

No fancy with the rear, on par with the original specs: Deore XT FH-M732 freehub and CS-HG90 7-speed 12-28T cassette.
Attachment:
File comment: Shimano Deore XT FH-M732 freehub
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Attachment:
File comment: Shimano Deore XT CS-HG90-7 cassette
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And so were the skewers.
Attachment:
File comment: Shimano Deore XT skewers
34.jpg
34.jpg [ 322.1 KiB | Viewed 1123 times ]


Last edited by foxb13 on Sun Nov 10, 2019 4:08 pm, edited 5 times in total.

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